US3891398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc brake pads formed from two sintered metallic layers
Assignee: Federal Mogul Friction Products Ltd
•
Filing: 1973-01-19
•
Granted: 1975-06-24
•
Expires: 1993-01-19
Abstract
Abstract A monolithic block of friction material comprises two adjacent layers formed from metallic powders and the matrices of the two layers comprise the same metal of a wear-resistant nature, for example iron or steel, the layer forming the friction lining including (i) less of this metal than the other layer forming the backing medium and (ii) a frictional and/or lubricating additive for example coke or graphite. The monolithic block is formed from the two layers of metallic powder by pressing at elevated pressure and sintering the resulting consolidated powder block.
Inventors
- 👤 Jean Odier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:12
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/027; B; B29; B29C; B29C43/00; B29C43/006; B22; B22F; B22F3/00; B22F3/002; B22F3/12; B22F3/16; B22F7/00; B22F7/002; B22F7/004; B22F7/006; B22F7/06; B22F7/062; B29L; B29L2031/00; B29L2031/16; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207; C22C33/0228; C22C33/0257; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/927; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12146; Y10T428/12451; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965; Y10T428/12986
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
95 words
A MONOLITHIC SELF-SUPPORTING DISC BRAKE PAD CONSISTING ESSENTIALLY OF TWO CONSOLIDATED LAYERS OF SINTERED METALLIC POWDER, WHEREIN (I) AFIRST OF SAID LAYERS FORMS THE FRICTION LINING OF THE PAD, (II) THE SECOND OF SAID LAYERS FORMS THE CARRIER PLATE OF THE PAD, (III) THE MATRIX OF EACH LAYER COMPRISES A SINTERED WEAR-RESISTANT METAL POWDER COMMON TO BOTH LAYERS, AND (IV) THE FIRST LAYER COMPRISES A SMALLER PERCENTAGE BY WEIGHT OF THE SINTERED WEAR-RESISTANT METAL POWDER THAN THE SECOND LAYER AND ALSO COMPRISES A FRICTION ENHANCING OR LUBRICANT ADDITIVE COMPATIBLE WITH THE SINTERED WEAR-RESISTANT METAL POWDER.
Claim 2
Dependent Claim
95 words
A MONOLITHIC SELF-SUPPORTING DISC BRAKE PAD CONSISTING ESSENTIALLY OF TWO CONSOLIDATED LAYERS OF SINTERED METALLIC POWDER, WHEREIN (I) AFIRST OF SAID LAYERS FORMS THE FRICTION LINING OF THE PAD, (II) THE SECOND OF SAID LAYERS FORMS THE CARRIER PLATE OF THE PAD, (III) THE MATRIX OF EACH LAYER COMPRISES A SINTERED WEAR-RESISTANT METAL POWDER COMMON TO BOTH LAYERS, AND (IV) THE FIRST LAYER COMPRISES A SMALLER PERCENTAGE BY WEIGHT OF THE SINTERED WEAR-RESISTANT METAL POWDER THAN THE SECOND LAYER AND ALSO COMPRISES A FRICTION ENHANCING OR LUBRICANT ADDITIVE COMPATIBLE WITH THE SINTERED WEAR-RESISTANT METAL POWDER.
Claim 3
Dependent Claim
26 words
A disc brake pad according to claim 1, wherein the carrier plate layer has a greater depth at its edges than towards or at its center.
Claim 4
Dependent Claim
24 words
A disc brake pad according to claim 1 wherein the materials forming the layers have been deliberately mixed at the interface of the layers.
Claim 5
Dependent Claim
26 words
A disc brake pad according to claim 1, wherein the carrier plate layer is provided with a structure favoring dissipation of heat into the ambient atmosphere.
Claim 6
Dependent Claim
32 words
A disc brake pad according to claim 1, including a wear indicator located in the carrier plate layer at the level of the interface between the carrier plate and friction lining layers.
Claim 7
Dependent Claim
11 words
A friction material according to claim 1, having the following composition:
Claim 8
Dependent Claim
129 words
A disc brake pad as claimed in claim 1, produced by a powder metallurgy technique which comprises (i) placing in a mould two successive layers of material in powder form, one adapted to form a friction lining and the other adapted to form a carrier plate, a sinterable wear resistant metal powder being common to both layers, said one layer comprising a smaller percentage by weight of the metal powder than said other layer and said one layer comprising also an additive compatible with the metal powder; (ii) consolidating the powders layers by applying thereTo a pressure within the range from 29 X 103 to 116 X 103 p.s.i. (200 to 800 MN/m2) and (iii) sintering the consolidated powder layers under a controlled atmosphere to form a monolithic block.
Claim 9
Dependent Claim
20 words
A disc brake pad according to claim 7, wherein sintering has been effected at a temperature of about 1,000* C.
Claim 10
Dependent Claim
23 words
A disc brake pad according to claim 7, wherein sintering has been effected for a period of from 15 minutes to 3 hours.
Claim 11
Dependent Claim
21 words
A disc brake pad according to claim 7, wherein sintering has been effected in the absence of an applied mechanical pressure.
Claim 12
Dependent Claim
30 words
A disc brake pad according to claim 7, wherein the sintered block has been subjected to an elevated pressure of less than 116 X 103 p.s.i. (800 MN/m2), after cooling.
Claim 13
Dependent Claim
23 words
A monolithic disc brake pad according to claim 1, wherein the carrier plate layer incorporates an additive which improves the friction properties thereof.
Claim 14
Dependent Claim
23 words
A monolithic disc brake pad according to claim 1, wherein the carrier plate layer incorporates an additive which improves the thermal insulation thereof.
Claim 15
Dependent Claim
27 words
A disc brake pad according to claim 12, wherein the additive incorporated in the carrier plate layer is selected from the group consisting of coke and graphite.
Claim 16
Dependent Claim
27 words
A disc brake pad according to claim 13, wherein the additive incorporated in the carrier plate layer is selected from the group consisting of silica and alumina.
References Cited (Backward Citations)
US3087814A
Cited
US2970675A
Cited
US3037860A
Cited
US3114197A
Cited
US3069758A
Cited
US3761256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |